(S)-7,8-dihydro-8-ethoxymethyl-3-(5-hydroxyhexyl)-1-methyl-1H-imidazo[2,1-f]-purine-2,4(3H,6H)-dione 、
甲基磺酸酐 、
甲醇 在
4-二甲氨基吡啶 silica gel 、
乙酸乙酯 作用下,
以
氯仿 为溶剂,
反应 16.0h,
以to provide (S)-7,8-dihydro-8-ethoxymethyl-3-(5-methanesulfonyloxyhexyl)-1-methyl-1H-imidazo[2,1-f]-purine-2,4(3H,6H)-dione (160 mg, 94% yield) as a white powder的产率得到(S)-7,8-dihydro-8-ethoxymethyl-3-(5-methanesulfonyloxyhexyl)-1-methyl-1H-imidazo[2,1-f]-purine-2,4(3H,6H)-dione